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Difference between Blow off steam and Blow smoke

blow off steam—(also: let off steam) give vent to one’s anger or frustration (by talking in an unrestrained manner, etc.):

  • Perhaps the best way to blow off steam and get rid of stress is through exercise.

blow smokespeak deceptively; brag or exaggerate:

  • Hopefully they aren’t blowing smoke about how good they are because I’ve invested heavily with them.